Transcript The Tile-HCAL, studies and time plans, V. Korbel, DESY, 30m •The last meetings since ECFA-DESY workshop in Prague (Nov.

The Tile-HCAL, studies and time plans,
V. Korbel, DESY, 30m
•The last meetings since ECFA-DESY workshop in Prague (Nov. 2002)
•actual status of R&D:
–scintillators
–WLS-fibres, clear fibres, fibre coupling
–optimisation of tile-fibre system (TFS)
–photodetectors
–preamps
•measurements with the minical
–readout and DAQ
–cosmics,
–noise and pedestals
–LED-calibration
–plans for e-beam test at DESY (summer 2003)
•status of preparations for the 1m3 prototype for E-flow beam tests
–photodetectors
–preamps
–VFE RO boards
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
1
The last Tile-HCAL meetings
•
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•
•
•
Since the Prague ECFA-DESY workshop:
main meetings:
4.12.2002, 20.1.2003, 4.3.2003
LAL-Orsay, preamps for APDs, dela Taille, Cvach,...
Dec. 2002
CERN, VFE for APDs with DUBNA, I. Golutvin, I. Tiapkin, F. Sefkow, Dec. 2002
DUBNA, VFE, I. Golutvin, I. Tiapkin, Y. Gilitski, Minsk people,....
Febr. 2003
ITEP and MEPHI, Moscow, B. Dolgoshein, V. Rusinov,.....
Febr. 2003
LAL-Orsay, VFE for APDs, dela Taille, I. Tiapkin, F. Sefkow,...
Febr. 2003
????
future main meetings: 6.5.2003, 17.6.2003 ??? To be fixed these days
Documentation:
1. tasks, institutes, people, time plans, meetings, talks and minutes in Web:
>>>http://www.desy.de/~korbel/see/tilehacal/....
2. detailed Tile-HCAL R&D report, Oct. 2002, available:
“ The Tile-HCAL Calorimeter for the TESLA Detector, a Status
Report on the R&D-Studies”
3. new web-page with better guidance is prepared, open next week!
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
2
Presentations for the Tile-HCAL on this workshop
•CALICE collaboration meeting (Monday,31.3.03,NIKHEF):
V. Korbel, Introduction to CALICE Tile-HCAL meeting:
“Status of the R&D”, 15’
M. Danilov for ITEP, R&D in Russia, 20’
B. Dolgoshein for MEPHI,
News from the Si-PMs as Photodetetctors for the Tile-HCAL, 20’
S. Nemecek for Prague,
APD’s for the HCAL, gain stability
V. Korbel for DESY, LPI
Tests with the minical, plans for prototype, time scale
•DAQ and Trigger meeting:
V. Korbel, DAQ concepts for the minical and Tile-HCAL prototype, 10’
P. Daucey, CALICE beam test DAQ
•Calorimeter Session, Hadronic Calorimeter
V. Korbel, The Tile-HCAL, studies and time plans
V. Morgunov for DESY, ITEP, Prototype Tile-HCAL Simulation with
Si-PMs as Photodetectors
P. Dauncey, DAQ for the CALICE beam test
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
3
The plastic scintillators for the tiles
The different scintillators studied:
PVT: -BC-408, BC-404,.....
PS:
•SCSN-81, Kuraray
•new R&D scintillators from Kuraray:
•ITEP/Vladimir: BASF-143, others
•Protvino/LPI SC-306M, SC-307.....
•Charkov
The PS scintillators based on PS
•show ~0.5..0.65 LY of PVT
•but ~ 5 x cheaper
•possibility to cast them in tiles
(with grooves)
>>> made studies on
•LY and uniformity, ok?
•>>> decision to select producer
ECFA-DESY,
Amsterdam
M.Danilov,CALICE main
recent measurements in ITEP
V. Korbel, DESY and CALICE
4
Details of TFS Optimisation Studies
Centre/straight WLS-fibre
Diagonal/bent WLS-fibre
No stress on fibre,
fibre refl.
=tile reflector
L=7,85cm
L=5cm
Double looped fibre
•strong fibre bend,
•most stress on fibre,
•probably ageing damages,
•fibre end fibre reflector
L=31,4cm inside tile >>>
special reflective coating
needed ?
ECFA-DESY,
Amsterdam
more stress on fibre,
fibre refl.
=tile reflector
L=7.85cm
clear RO fibre to couple:
1-3.5m in detector,
light attenuation <18%
1.1 mm hole in center
•drilled and polished?
•could it be made during tile moulding?
V. Korbel, DESY and CALICE
5
The WLS-fibres
1 mm diameter, double clad,
BC-91A
BC-92
BC-Dayglo, red range extended
Kuraray, Y-11(100-500ppm) WLS shifting component
polishing of fibre end
fibre end reflector
attenuation length
conversion efficiency
stability against bends, loops (2.4 mm radius)
ageing agains bend stress, in radiation field
>>>> Y-11(300) for short fibres
Y-11(500) for long fibres
material available for all minical channels
ECFA-DESY,
Amsterdam
University Friedberg/Giessen
V. Korbel, DESY and CALICE
6
The coupling of WLS-fibres to scintillator
, similar to BC-408, 404
Have selected Kuraray Y11(300)
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
7
TFS LY measurements at ITEP
M.Danilov,CALICE main
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
8
The actual achieved LY for the TFS
Scintillator BC-408,
, Kuraray, WLS-fibre
3M-Super Radiant Reflector
Light yield/tile/MA-PM
100% reflectivity at fibre end
All together:
22+/-1.5 pe (BC-408, Aug. 2002)
>> 26 (new results from ITEP)
•both Russian scintillators
have ~ 2/3 of BC-408 LY
•~20% more LY can be expected
by improving polishing
of WLF-fibre end,
•no gluing needed anymore
Treatment direction
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
9
Light attenuation measurement in RO-fibres
WLS-fibre, Kuraray
10,20,50 and100 cm
clear-fibres, Bicron and Kuraray
•attenuation in clear RO-fibres minimal:
BC-98: 0,65 db/m ~ 40% for 5m fibre
•no damage observed for bent fibres
(d=5 cm)
•no ageing during 1 day observed
>>> Y11(300), on tile + BC-98 RO-fibre
(ITEP)
Photocathode sensitivity of APD
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
10
WLS fibre-clear fibre connection
WLS-fibre >>clear fibre:
•standard is gluing with optical glue
better procedure:
•thermo-fusing, ~ 80-120oC,
heating by 1-2 windings of resistive wire
fibres cut, adjusted and pushed together
in glass tube of 1.10 mm inner hole diameter
few A current for a few sec.
>> connection difficult to find by eye
no light loss seen at connection
first results: 84% transmission
improvement potential
still available in the fusing procedure
Well established procedure at FNAL
for CDF calorimeter, 90% transmission
>>production parameters
can be optimised
Pressure, temperature, time
guide tube diameter ?
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
11
Photodetectors
The remaining candidate photodetectors:
APD’s:
S8664-55spl, 3x3mm2,
S8550, 32 pixels of 1.6x1.6mm2
at test in Prague
Si-PM’s (MEPhI):
gain ~2*106
photocathode eff. ~ 15-20%
sizes: 1x1mm2, 576 and 1000 pixels/mm2
-800-1200 Photodetectors needed (APDs)
with 3-7 tiles combined to calo cells or
-3200-4800 Si-PM’s of 1x1mm2 needed alternatively
-decision to use both detectors in prototype
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
12
APD’s
Hamamatsu, 3x3mm APD, S8664-55spl
package is same as S8664-55 (5x5 mm APD)'s
with resin coating.
Delivery time takes 1.5 months for 30 pcs
typical performance:
gain= 50
100
>1000 possible
Id 600pA
1.2nA
C 28pF
28pF
have 6 APD’s for tests
170 Euro per piece, for 30
122 Euro per piece, for 300
60 Euro per piece, for 1500
25 Euro Hamamatsu
? for S8664-55
> 100 000 APD’s?
Future plan (Hamamatsu) :
APD Array :
try to make low capacity type,
proceed with
"3 x 3 mm, 4 x 4 ch APD-array".
target characteristic is as follows.
C : 15 pF
Variation of gain : +/- 20 to 30 %
GAIN M
C
100
250
Id
gain
200
150
10
100
50
0
0
50
100
150
200
250
300
350
500 V
400
bias voltage
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
13
SiPMs, Silicon Photomultiplier
42m
20m
pixel
h
Resistor
Rn=400
k
Al
Depletion
Region
2 m
R 50
substrat
e
Ubias
2
mV
2 ns
ECFA-DESY,
Amsterdam
R&D at MEPHI (Moscow),
B. Dolgoshein,
together with PULSAR
(Russ. Industry)
Some features:
• Sensitive size 1x1mm2 on 1.5x1.5 mm2
• Gain 2106 at Ubias~ 50V
• Recovery time ~ 100 ns/pixel
• Nuclear counter effect: negligible
(due to Geiger mode operation)
• Number of pixels: 576, now 1000/mm2
• Dynamic range > 200
For further details see:
«Advanced study of SiPM»
http://www.slac.stanford.edu/pubs/icfa/fall01.html
V. Korbel, DESY and CALICE
14
Performance of SiPMs with 1 scint.Tile
minical
4-8 pe
576 px
53-55V
10 pe,
576 px
54V
15 pe
1000 px
Si-PM on tile
DESY e-test beam
with various Si-PMs (MEPHI)
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
15
Si-PM’s,
dark
detection
MIP Detection
by onerate
cell ( 3 and
Tiles + MIP
3 SiPMs)
8
10
1,0
7
10
0,9
0,8
5
Dark rate, Hz
10
0,7
4
10
0,6
3
10
0,5
2
10
0,4
1
10
0,3
0
10
0,2
Sum of 3 tiles,
0,1 test DESY
e-beam
-1
10
-2
10
0
5
10
15
20
Threshold, phe
ECFA-DESY,
Amsterdam
MIP detection efficiency
6
10
25
30
98% efficiency
V. Korbel, DESY and CALICE
35
0,0
40
576pix/mm2
From Elena Popova, MEPhI
16
Minical array
Stack and Tile structure
Assembled with up to
27 scintillator layers,
of 9 tiles each,
5x5X0.5 cm3
243 scintillator tiles
or
81 cells of 3 tiles
read out by
~ 50 cm WLS fibres to
photo-detectors:
Aim of this device is:
cosmics, study of:
•LY
•uniformity of response
•calibration with MIPs
•stability of MIP signals
•different photodetectors
•long term ageing
LED monitoring:
APD’s:
3 tiles/APD
MA-PMs: 16fold, 3 tiles/pixel •stability
•dynamic range
Si-PMs: 1 tile/Si-PM
•also:1x32 M-APD array (Pra
e-beam, study of:
•energy resolution
•constant term
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
17
Minical, pictures
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
18
Minical, pictures
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
19
Where are we?
Status now, for minical tests:
•WLS-fibres ordered and delivered, 500m(Y11-300) and 100m(Y11-500)
•3M super-reflector foil available
• minical now modified by Prague group:
9 mm gaps, larger housing, windows for feed-through, light tight,
easier access to interior
•6 new Hamamatsu APD’s (3x3 mm2, 190 Euro/piece) now at DESY
to be inserted in minical for MIP tests, yield next 3 weeks ?
•Si-PM production/delivery schedule (see Boris talk)
next 30 available, than 100 up to June, 1000 pixels/mm2
•TFS geometry, reduce variety soon, up to end April
•design/build cassettes, for 9 tiles, 9 mm tick, 27 pieces for July tests
•preamps to design/order >> LAL Orsay: 7.4.03, delivery 30.6.03
R&D for Minsk/Gilitski, Prague, DESY/Smirnov types goes on
•APD’s and Si-PM’s to order >> 30 APD’s and ~100 Si-PM’s (with 1000pixels)
•HV distribution to design/order/build:
•380-420V, APD, 30 channels
•and 55-68 V, Si-PM, 100 channels
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
20
„minical“-tasks, TFS production details
The TFS for the minical:
--81 tiles with Si-PMs, short WLS-fibres, SI-PM inserted, from Vladimir/ITEP
--81 tiles from Protvino, with cylindrical holes??,
cast in moulds, together with the tiles or drilled, to insert the WLS-fibres
--81 tiles from BC-408, cut and polished at DESY, with
a) WLS-fibres in cylindrical, drilled central holes, 50 cm more fibre to APD’s
b) WLS fibres in curved diagonal grooves, also 50cm to APD’s
• Hope to have a technology to replace the WLS-fibre
outside the tiles by fused clear fibres, who does it?
• Can ITEP prepare also the 81 Protvino tiles?
>>I.e. make grooves or holes, insert fibres, wrap tiles, test in black box?
• A special >5 cm long drill of 1.1 mm diameter is in preparation at DESY.
• We need to group tiles with equal (+/-5%) LY,
3 tiles of same response to one APD. Thus LY of all 81 TFS to be measured
with a source. To do at DESY with help of Protvino/LPI people.
Our Time scheme:
•Production of tiles in April/mid May
•Machining/Wrapping in May/ mid June
•Tests and selection in June/mid July
•Delivery to DESY mid July
•Start insertion in minical last 2 weeks in July
•Cosmic calibration tests 2 first weeks in August
•We need more participating physicists during minical set-up and tests.
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
21
Support frames for TFS
For APD’s
For SI-PMs
MEPhI, ITEP
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
22
Direct TFS readout with SiPM
in minical at DESY
M.Danilov,CALICE main
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
23
Shower containment in minical, DESY e-beam
1 section, 9 layers, 81 cells
MIP peak used for calibration
Shower leakage
to correct with
the middle section of minical
Studies by V. Andreev >>>
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
24
Energy resolution in minical, DESY e-beam
s/E=a/sqrt(E) (+) c
Aim is to study:
the effects contributing
to the constant term:
•LY fluctuations within tiles
•lat. non-uniformity of response
•MIP calibration precision
•stabilty of calibration
•noise
•dead gaps between tiles
•leakage
calibration
0
10
20
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
a
18,16
18,29
18,54
+/- da
0,12
0,18
0,21
c
0,5
3,35
6,41
25
+/- dc
0,42
0,26
0,17
Energy resolution in minical, Si-PM, 576 pixels
calibration
0
Poisson
Poisson+Sat.
last 4 points
ECFA-DESY,
Amsterdam
a
18,16
18,95
17,27
16,07
+/- da
0,12
0,17
0,16
0,39
c
0,5
0,33
1,85
3,44
+/- dc
0,42
0,53
0,4
0,4
V. Korbel, DESY and CALICE
Saturation curve:
number of fired pixels vs
number of photons x
photo-conversion efficiency
s/E=a/sqrt(E) (+) c
26
Calibrating the minical cells
BC-408 scintillator
single tile,
diagonal bend groove,
cosmic -peak,
60 cm WLS fibre RO
MA-PM
23,1-26,2 pe
•Noise, randoms
•cosmics
•LED-pulses
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
27
Calibrating minical cells, studying LY
BC-408 scintillator
single tile,
diagonal bend groove,
cosmic -peak,
60 cm WLS fibre RO
to MA-PM
23,1-26,2 pe
ECFA-DESY,
Amsterdam
Random and
pedestal subtracted
cosmic -peak spectra
of some PS-scintillators
from Protvino/LPI
9-13.3 pe
V. Korbel, DESY and CALICE
28
Remote web access to the measurements
Study the results of up to 64 channels with MIP’s
At
DESY:
via web:
+sw-tools:
•F. Krivan
•V. Dodolov
•A.Terkulov
•S. Karakash
Install in minical:
different
•scintillators
•fibres
•photodetectors
•pre-amps
•supply voltages
•trigger conditions
LED monitoring
Start run with
new components
or new settings
all 24 hours.
Look for:
•gain
•stability
•signal width
•signal noise separation
•calibration with MIP’s
•run parameter file
ITEP
LPI
MEPHI
Prague
Protvino
DESY
very....
similar situation later during prototype running in
beam test at other laboratories
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
29
HCAL prototype for E-flow studies
Required volume ~ 1 m3
~ 800-1200 calorimeter cells
Fe-structure can accept
•analogue
•or digital HCAL??
10 GeV pions
100 cm
Leakage
detector needed!
100 GeV pions
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
30
The Prototype stack
Design/Construction Studies:
•TDR
•LC-notes
•K. Gadow, VK
DESY, Jan. 2003
Need now to come to decisions
•how to build?
•Steel, ss?
•2 half modules (magn.field?)
•Where?
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
31
more on tile sizes and total numbers
n
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
x
5,3
5,37
5,44
5,51
5,59
5,66
6,14
6,22
6,3
6,87
6,95
7,04
7,12
7,81
7,9
7,99
8,08
z
5,11
5,11
5,11
5,31
5,31
5,31
5,9
5,9
5,9
6,64
6,64
6,64
6,64
7,58
7,58
7,58
7,58
N
780
780
780
750
750
750
630
630
630
520
520
520
520
420
420
420
420
10240
n
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
x
8,92
9,02
9,12
9,21
10,25
10,36
10,47
10,58
10,69
12
12,12
12,24
12,36
12,48
14,18
14,47
14,77
15,19
15,83
15,88
19
z
8,85
8,85
8,85
8,85
10,21
10,21
10,21
10,21
10,21
12,07
12,07
12,07
12,07
12,07
16,59
16,59
16,59
16,59
16,59
16,59
16,59
total sum in HCAL Barrel module: 14410
ECFA-DESY,
Amsterdam
N
330
330
330
330
260
260
260
260
260
198
198
198
198
198
128
112
96
80
64
48
32
4170
38 layers require
~ 5000 tiles with
38 different tile sizes
casting with
minimum number
of moulds!
Need to fix tile sizes
soon!
tiles
V. Korbel, DESY and CALICE
32
Prototype channels
cell- instrumented: layers/ tilesize layers
layer (cmxcm):
cell (cm2)
tiles: APD's APD's Si-PM's APD's Si-PM's APD's Si-PM's
1
2
3
4
5
6
7
8
9
60
60
60
80
80
80
100
100
100
total
ECFA-DESY,
Amsterdam
60
60
60
80
80
80
100
100
100
3 5x5
3 5x5
3 5x5
4 8x8
4 8x8
4 8x8
5 10x10
5 10x10
7 20x20
38
9
21
31
38
432
432
432
400
400
400
500
500
175
3671
144
144
144
100
100
100
100
100
25
957
432
432
432
400
400
400
100
100
25
225 2496
V. Korbel, DESY and CALICE
432
432
432
400
400
100
100
100
25
325 2096
432
432
432
100
100
100
100
100
25
525 1296
33
The fraction of prototype cells fired
Simulation studies
for single pions:
beam energies:
10, 40, 100 GeV
RO threshold cuts:
0, 0.25, 0.5 MIP
standard granularity:
5x5cm2, 3 cells deep(3/9)
6x6cm2, 3 cells deep(4/12)
8x8cm2, 2 cells deep(2/10)
12x12cm2, 1 cell deep (1/7)
969 cells in total
By V. Andreev
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
34
Energy sharing between ECAL and HCAL-PT
The following studies
from V. Andreev:
ECAL and TC
have effect on
energy resolution
~ 45-55% of events
depose more
than 2 GeV in ECAL
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
35
Prototype TC for energy resolution
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
36
The contribution of the TC to the energy measurement
E(ECAL) +E(HCAL) <--> E(TC)/(E(ECAL) +E(HCAL))
Epion=5,10,20,30,50 GeV
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
37
The VFE-ROB-scheme, APDs
Online/Offline
Gain/HV
monitoring?
DAC-signals
LED
signals
HV,
380-420V
dV/V~10-4
Array of
single APDs
or matrices
ECFA-DESY,
Amsterdam
PIN diode for
LED
monitoring
cosmic beam
DAC
Charge injection
pedestals
charge
sensitive
preamps
pulse
shapers
Sample
&
hold
V. Korbel, DESY and CALICE
Trigger/
RO
clock
Multi
plexer
(analog)
38
Time Planing, 4.3.2003, I
1. Pre-selection of appropriate photodetectors
available: APD’s(~6) and Si-PM’s(~10)
ordering larger quantities for more tests in minical (March).
Need 30 APD’s and 162 Si-PMs in total, Si-PM’s (1000 pixels!)
2. studies and development of integrated preamplifier/shaper circuits,
and MEPhI Si-PM with FE preamps.up to end April.
Operation in Minical.
3. For minical: decide on the optimal APD-preamp type, end March:
---study Minsk and Prague preamps with APD’s in minical,
--- important: get noise contribution to MIP-peak (noise vs MIP efficiency)
---order/loan ~2 prototype CALICE-ECAL PCI preamp boards
(which should later integrate the photodetector connections)
4. Concept/design final preamp prototype boards for
the 1000 channel test prototype, ....all and DUBNA?, (April)
5. design prototype boards for all APD and Si-PM channels, DUBNA?,(May)
6. Up to May to decide, which photodetectors in which quantity to use:
•
1000 APDs or ~ 5000 Si-PMs,
•
or both types in relevant quantities e.g. 200/2500
7. order of all photodetectors for the Tile-HCAL prototype, June
8. Decide/order HV power supply/ distribution, June
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
39
Time Planing,II
9. Need Russian scintillators for tests in minical, (~20 each, March)
10. ordering Bicron BC-408 for the larger tile sizes, ~8 m2, up to Summer
11. define optimal cell and tile sizes,
from software and hardware studies, decision up to end of April
12. Prepare 300 tile minical test at DESY, (100/100/100) May
13. design of the prototype stack, April/May
14. a detailed tile-plate assembly concept has to be defined, July
15. Minical test at DESY, with final photodetector types, July-September
16. building of stack steel absorber structure, in ITEP or Prague? >August
17. casting/machining of ~3700 tiles up to September,
(in factory ? or machining at DESY, or elsewhere?)
18. assembly of the TFS in tile plates (detector cassettes), November
19. TFS connection with photodet. and preamps, start November-December
20. RO via CAMAC as long as British DAQ not available, end 2003
21. winter 2003/2004 operation studies with LED gain monitoring,
and calibration studies with cosmic muons,
with increasing number of calorimeter cells as assembled.
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
40
Outlook
1. Enough LY from TFS (~200 photons at photodetector)
2.
3.
4.
5.
6.
APD’s and SI-PMs are the photodetectors which do the task
Preamplifiers with low noise are essential (MIP-noise separation,calibration)
Minical test to establish calibration precision in summer
Now design of prototype boards for APD and Si-PMs, DUBNA
Photodetectors, large quantity to order in summer:
•
1000 APDs or
• ~ 5000 Si-PMs or
•
both types in relevant quantities e.g. ~250/3500
7. Prototype stack (1m3) will be build in summer
8. Assembly of PT-stack with TFS starts in Jan. 2004
9. Spring 2004 is used to set up and calibrate all channels with cosmics.
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
41
ECFA-DESY,
Amsterdam
V. Korbel, DESY and CALICE
42